"Ko Ko Bop" is a song recorded by South Korean boy band Exo for their fourth studio album The War. It was released in Korean and Chinese versions by S.M. Entertainment on July 18, 2017.

Produced by Styalz Fuego, "Ko Ko Bop" is described as an energetic reggae song with rhythmical reggae and bass guitar sounds. "Ko Ko Bop" was co-written by EXO members Chen, Chanyeol and Baekhyun. It was digitally released on July 18, 2017 and physically on July 19 along with the album. According to Chanyeol, the term "Ko Ko Bop" means "Fun Dancing".

Talking to Billboard about producing the song, Staylz Fuego stated that while writing the song the other composers, they were going with a reggae type of a song, but after adding the drop after the chorus the song took a different distraction, and they settled for a reggae-pop song after. The composers stated that they though the song will be for a girl group because Shaylen Carroll, one of the composers, a female, did the demo but eventually it went to EXO. Fuego stated "The song was actually in a higher key -- I think three semitones higher -- so it was more fitted for a female group originally."

About writing the lyrics of the song Carroll stated "When I was recording some melody ideas I kept on singing nonsense phrases and one was “Shimmy shimmy Ko Ko Bop,” which we all thought was super quirky and catchy. So we built off that and turned it into something real". Carroll went and described the "Ko Ko Bop" as a song that is about "not worrying about things", "going with the flow" and "not worrying about the haters". Chen and Baekhyun also talked with Billboard about writing the lyrics of the song, Chen stated that the Baekhyun, Chanyeol and himself each wrote the lyrics separately and worked on putting the lyrics together for the song afterwards by selecting the lyrics that would suit the song the best. Baekhyun stated "I wanted my lyrics to have people to become more carefree, release their stress and dance away with the music."

A teaser of "Ko Ko Bop" music video was released on July 17, 2017 by S.M. Entertainment. The Korean and Chinese music videos of "Ko Ko Bop" were released on July 18. The music video was filmed in Seoul, South Korea.

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